Allocation of outgoing lines in automatic telecommunication systems



U. KESTEN ETAL ALLOCATION OF OUTGOING LINES 1N AUTOMATIC Sept. l5, 1959TELECOMMUNICATION SYSTEMS Filed March 28, 1955 United StatesIALLOCA'IIONGFGUTGOINGLINES "IN AUTO- vTELECOlVHMHJJNJGATIGNf SYSTEMS-many, assignorshto'isiemensz Halske :Aktiengesellschaft, Munich,Germany, a German corporation 'Application March28, '19515; Serial'No:'497,308 'Y y InIGermany-March 2,4950

PublicJJaw619fAugust .23, 1954 Patent expiresMarch 2, -1970,1Q..alloutgoinglines at least .part` of the` outgoing llines will beblocket'ljfor,tlie'tluratiolltfthei disturbance, which may result y in.considerable restriction. of fthe ,traic such` farreachingrestrictions; inA case A of disturbance at thecominon ,redying device.f- Theinvention proposes t solve 'the problem bydisposing relays' whichcontrol the inlets to the outgoinglines inparallel to a control.conductor,.and,providing delaying deyicesjsequence chain) vcoordinatedor associated `with therelays to e'ect the V.seizure of only oneoutgoing" line.

n A? disturbance of one, of 'theparallel circuitsfor. of one ,contactofthe contacts controlled by the parallel-connected relays can alwaysblockonly the respective outgoing line but has no effect on'thereadiness for service of the other outgoingflines.

".The,known chain circuits make it possible to allot toindividualhgroups of.' incoming jlines a certain outgoing ",line ongroupof outgoing`lines as'the one to'be usedzirst. According to' ltheinvention, this advantageof the chain relay'circuitsis combined with theadvantage of little etectl of a'disturbance occurring in aparallel-connected connecting relay' (asequence chain) onjthe tra'ic, inthat besides the sequence` chain a'.conventional chain relay e circuitis-'provided' for'the readying of a'. free Outgoing'line. A signalinitiating the joining of an incomingwith an outgoing line isngivensimultaneously over the sequence chain and over'thevchainrelay circuit.

"Thejnvention will now be explained with reference to h"the',-accornpanying -drawing showing inz'fligsx 1 and. y2` in diagrammaticmannertwo examples thereof.

y Qnly ltheswitching meansl andv circuits indispens'al'ule for l thevunderstanding ofthe invention are *shown ,in the draw- L AAings. Theequipmentofthe incoming and outgoing lines '-isnot shown;4 as it.isiknown and doesnot fonn-parnof vithelinvention.AIir-bo'th;'examples"it is assumed 'that' outgg'oing'flin'es `areconnected-by line'nrldersl to' calling in- V`coming lines. The-'linelinders may be.' of any suitable A-lknownfde'sign They-maybe'step-byistepv switch mecha- If. a. disturbance, occurs.A attheswitching' device common Underlying the invention istheproblemfhowtoprevent.. e

vnismsf motorldriven switches, crossbar switches; or r'elay `switches7 vI *In theYembodiment-fshownin"lig.l 1,',an idle outgoing '1flinemaybe-held readyfo-r service at all' times; or readying line.

2,904,635 f.. Patent-ed Sept. .f-l 5, 1 959 ICC..

:Jian: idlek outgoinglinefis Y todae ready nat. alltimes, con-.tacelanl- (bottom/.ot Eig'l.) mustzbexreplaced-by the jumper'QshOWnin'brokenvlines r.Upon-.connection.of theseryicebattery,'energizing cir .tcuitst are. closed for the. auxiliaryrelays.(preparingrelays) H1, H2, H3, etc.,.wlhiohaarerespectively`associated-.with the connecting re1ays..:R1,: R2,.,R3,..etc.,fthegcircuitffor @relay H1 extending resistor w1; to f. u l viRelays:HAT-H3, etc.,`-'operate3in parllelewith H1, each havingagain acapacitor connectedparallel to itV anda "resistor serially-relatedthereto. "'"Iliediierentmagnitude ofthe resistorswL W2, w3, etcsandthedierenticapaciities ofv thecapacitorsfK1,'-K2,;K3, limpart to therelays H1, H2, H3g'etc3diferent response delays, causing sequenitial 1operationtl'iereof; .relayY H1 -responding 'rst, ,relay H2respondingwith` adelayof someems., relay H3 respond-Jingfthereafteryjetc. Y'Therst energized relay'HI connects'theconnectinge'relayiRlftohe common-conductor 6 at Vcontact 7h1-ina'circuit extending 1 '(`2)lFrom vrelayPL conductor-6, contact "7h1,con- *R1 -iis short-circuitd and the-potentialonconductorr .6F isthereby reduced so that if forreiiamplefcontact 10112 should closebefore energZation of relay P1 and consequent opening of the energizingcircuits for the other H relays at Contact Zpl, relay R2 receivesinsuicient @operating current.

:At Goma-ct' im @einenqhiiefbridged. :At omet 'z IZ'rIIthestartgrelay'Ql-is connectedfto theconductor 13. At-contactZpI-IelayF-Pl' opensthe circuit ltrand henceialsolthetenergizingcircuitsforf-the other H- relays. All

H relays release. iAt- .contactf'14`p1-a`circuit isfprepared ffor theactuatiomoffthelstartrelay Q1.

If a.=call arrives oneone'of-fthefincoming lines-f (not A'wivhichfy by.4connection of'thev connecting relay `R2.ca.u.ses v'-the -readying-ofthe,` second outgoingline to' befjoined with another callingy linethrou'ghf line inderSAS2.

fRelay'Clreleases: upon termination. of the connection As contact Zpl isopen, the energizing circuit l for the relays-are notprepared. A l`Onlyafter a readie'd line, vfor example the second outgoingline, hasbeencoupled with -a calling line through IineQnderfASZ,.-andrelayf P12deenergized, are the-energizing circuits' for the H relays of thesequence chainprepared. RelayHI again energizes xiirst andmakesftheiirstjoutgoinglineayailable for anew 'connection' If-th'erefiseno kj'linapeil, circuit "1' isV completed only as arcallbecomes operative on an incoming lline and as `A.contact laici` "closes,i T'IThe.` rnode of. ,operation is .then analogousjtov .that'describedThe arrangemenL maynbasuch thatin .timesof `heavy itraiccontact lanllisl'short-circuitedwhyE l.the,.jumper f3,

and in time'of light traliic, for example at night or Sundays andholidays, this short circuit is removed. The temporary bridging ofcontact 1art1 may be effected by a suitable manually operated switch orautomatically in known and suitable manner under the control of a clock.

In the embodiment according to Fig. 2, the incoming lines are subdividedinto several groups. To each group is allotted an outgoing line with itsline nder as the one to be used rst. Each group of incoming lines has acommon call receiving relay. Only two contacts of each group of livecall receiving relays are shown. Contacts 20an11, 21an11 are closedincident to calls from lines of group l, and contacts 22an12, 23an12etc. are closed incident to calls from lines of group 2. Through thecontacts 21an11, 23an12, 25an13, 27an14 and 29an15, calling signals aretransmitted over a conventional chain relay circuit to the individualoutgoing lines or line iinders AS11 to AS15, while through contacts20an11 28an15 a control of the connecting relays R11-R15 is effected bya sequence chain.

'Ihe connecting relays R11 to R15 energize with delay because each has acapacitor-resistor arrangement connected in parallel with its windings Iand II. Each capacitor-resistor arrangement comprises a resistor andfour capacitors K1K4. By means of a distributor having six connectionpoints l-6 it is possible to connect in parallel with each connectingrelay a different capacitor in series with the respectively associatedresistor. Windings I and II of relay R11 are thus in parallel with thecapacitors K1, K2 connected in series over the connection points 1 and 4with resistor w11, while windings I and II of relay R12 are in parallelwith capacitor K1 in series with resistor w12, windings I and II ofrelay R13 being in parallel with the capacitors in series with resistorw13, etc. Since relay R11 is in parallel with the smallest and relay R15with the greatest capacitance, relay R11 has the smallest and relay R15the greatest energizing delay. The connecting relays R11- R15 with thecapacitor-resistor arrangements respectively in parallel therewith formthe sequence chain.

When current ows through their windings III, the connecting relays R11to R15 energize Without delay.

The contacts 20an11 and 21an11 are closed responsive to a callingsignal, thereby completing the following circuits, namely (4) Fromcontacts 21an11, 31011, relay R11 winding III to and From -l-, contact20an11, resistor, conductor 30, contact 32011,

relay R11 windings I and II O i capacitors K2, K1, resistor w11 VParallel to circuit 5 current is carried also through windings I and IIof each of the relays R12 to R15 and the capacitor-resistor arrangementslying respectively in parallel therewith, thus for example through thereadying device of the outgoing line which yis associated with linefinder ASIS, in a circuit v (6) From contact 20an11, resistor, conductor30,

Contact 33015 resistor w15, to

relay O11 of line nder AS11 is connected. When the line iinder nds thecalling line, relay C11 energizes. It opens the contacts 32011, 31011.At contact 38011 the chain relay circuit is extended. At the same time,if there is no other pending call, the call receiving relay controllingcontacts 20an11 and 21an11 is disconnected and these contacts areaccordingly also opened. Dueto disconnection of the positive potential,the capacitors of the sequence chain discharge over their respectiveconnecting relays which do not energize responsive to the dischargecurrent.

When a call comes in on a line of the yfourth group, contacts 26an14 and27an14 are closed. For the connecting lrelay R14, an energizing circuitis closed over its winding III when line nder A814 is idle. Relay R14energizes without delay and by short-crcuiting its winding I at contact36r14 prevents the connecting relays of the other line iinders fromenergizing over the sequence `chain after the charging of their parallelcapacitors. Only line finder A514 `is started by connection of its startrelay Q14 at contact 371'14, for searching for the calling line.

It `shall now be assumed that line iinders AS11, A812 and A815 as wellas other line finders that may be present are blocked. In the chainrelay circuit the contacts 31011, 39012, 43c15 are open. The contacts38011, 40012 and 44015 are closed. If with this conditiona call comes inon a line of the group whose common call receiving relay controls thecontacts 28an15 and 29an15, the energizing circuit will be closed overthe windings and II of the connecting relays R13 and R14 (sequencechain) which extend in parallel from the conductor 30. Over the contactchain, a circuit is completed for relay R3 winding III of the idle linender AS13 (7) From contacts 29an15, 44015, 38011, 40012, 41013, relayR13 winding III to Relay R13 energizes without delay, connects the startrelay Q13, and by shunting its high resistance windingI preventsenergization of relay R14 whose windings I and II are connected to theconductor 30.

It will be seen from the foregoing explanations that calling signals areimmediately passed on to idle outgoing lines over the relay chaincircuits as long as these circuits operate satisfactorily. If the chainrelay circuit is out of order, for example, if the contact 38011 overwhich the calling signals must due to Ithe blocking of the iinder AS11act on the connecting relay, fails to close, then the connecting relaywill be caused to energize over the sequence chain, that is, throughtheir windings I and II parallel with the conductor 30. The connectingrelays are caused `to energize over the sequence chain, notsimultaneously, but successively at intervals determined by therespective response delay, only one line finder at a time being startedthrough the sequence chain just as through the contact chain circuit.

Changes may be made within the scope and spirit of the appended claims.

We claim:

1. In an automatic telecommunication system having a plurality ofoutgoing lines accessible to switches and having rst control relaysrespectively individual to said switches, a device common to a pluralityof said first control relays for controlling the operation thereof toready the switches respectively associated therewith for operation inextending calls thereover, said device comprising a plurality of secondcontrol relays for respectively controlling the operation of said rstcontrol relays, a common control conductor, circuit means for connectingsaid second control relays in parallel to said control conductor, anddelay means respectively associated with said second relays forimparting thereto respectively different sloW-to-operate characteristicsto assure at any ytime seizure of only one outgoing line, said delaymeans being connected to said control conductor and comprisingresistor-capacitor means connected in parallel with a winding Vof eachof said second control relays.

2. A system and cooperation of elements according to claim 1, comprisingsignal means operative to indicate seizure of an outgoing line,connecting relays respectively associated with said second controlrelays, and circuit means governed by said second control relays forsequentially operating said connecting relays.

3. A system and cooperation of elements according to claim 1, comprisingsignal means operative to indicate seizure of an outgoing line,connecting relays respectively associated with said second controlrelays, circuit means governed by said second control relays forsequentially operating said connecting relays, and circuit meansgoverned by the respective connecting relays for inhibiting theoperation of other connecting relays.

4. A system and cooperation of elements according to claim l, comprisingsignal means operative to indicate seizure of an outgoing line,connecting relays respectively associated with said second controlrelays, circuit means governed by said second control relays forsequentially operating said connecting relays, and circuit meanscontrolled by one connecting relay upon operation thereof for connectingto the said control conductor a blocking potential to inhibit theoperation of other connecting relays.

5. A system and cooperation of elements according to claim 1, comprisingsignal means operative to indicate seizure of an outgoing line,connecting relays respectively associated with said second controlrelays, circuit means governed by said second control relays forsequentially operating said connecting relays, circuit means controlledby one connecting relay upon operation thereof for connecting to thesaid control conductor a blocking potential to inhibit the operation ofother connecting relays, a high resistance winding forming part of saidconnecting relay, and means for shunting said high resistance Winding toproduce said blocking potential.

6. A system and cooperation of elements according to claim 1, comprisingan auxiliary relay for disconnecting said second control relays, andmeans for operating said auxiliary relay over said control conductorwhich is common to said connecting relays.

7. A system and cooperation of elements according 'to claim 1,comprising signal means operative to indicate seizure of an outgoingline, connecting relays respectively associated with said second controlrelays, circuit means governed by said second control relays forsequentially operating said connecting relays, a start relay for eachline, means operative in the normal circuit condition of said system forreadying the outgoing line Ito be seized rst, and signal means foreecting the seizure of said readied line.

8. A system and cooperation of elements according to claim l, comprisingconnecting relays with different slowto-energize characteristics.

9.. The system and cooperation of elements according to claim 1,comprising a contact chain for controlling said relays.

10. A system and cooperation of elements according to claim 1,comprising a contact chain for controlling said relays, means forsignalling the joining of an incoming line with an outgoing line, andcircuit means for transmitting signals effected by said signal meansjointly with said delay means and said contact chain.

11. A system and cooperation of elements according to claim 1,comprising a contact chain for controlling said relays, means forsignalling the joining of an incoming line with an outgoing line,circuit means for transmitting signals eiected by said signal meansjointly With said delay means and said contact chain, connecting relays,and circuit means for jointly controlling the operation of saidconnecting relays from said delay means and from said contact chain.

12. A system and cooperation of elements according to claim 1,comprising a contact chain for controlling said relays, means forsignalling the joining of an incoming line with an outgoing line,circuit means for transmitting signals effected by said signal meansjointly with said delay means and said contact chain, connecting relays,circuit means for jointly controlling the operation of said connectingrelays from said delay means and from said contact chain, and meansoperable from said contact chain for causing said connecting relays tooperate Without delay.

13. A system and cooperation of elements according to claim 1,comprising connecting relays with different slow-to-energizecharacteristics, an outgoing line associated with a group of incominglines which is preferentially seized, the connecting relay associatedwith said outgoing line preventing upon actuation thereof operation ofanother connecting relay over said contact chain.

References Cited in the le of this patent UNITED STATES PATENTS2,149,646 Voss Mar. 7, 1939 2,201,651 Hatton May 21, 1940 2,431,850 VossDec. 2, 1947 2,600,648 Herrick June 17, 1952 2,631,277 Den Hertog Oct.7, 1952 2,709,720 Schauer May 31, 1955

